Blended galaxies in the Large Synoptic Survey Telescope

May 14, 2019 - 12:15 pm to 1:15 pm

Campus, PAB 232

Ismael Serrano

The next generation of dark-energy imaging surveys – so called “Stage-IV” surveys, such as that of the Large Synoptic Survey Telescope (LSST) – will cross a threshold in  the  number  density  of  detected  galaxies  on  the  sky  that  requires  qualitatively  different image analysis and measurement techniques compared to the current generation of Stage-III surveys. In Stage-IV surveys, a significant amount of the cosmologically useful information is due to galaxies whose images overlap with those of other galaxies on the sky -- so called "blended" galaxies. In this talk, I will give an introduction to blended galaxies in LSST and the statistical methods that can be used to quantify measurement error when these types of galaxies are present.